WebStorm 2016.1 Help

Excluding Files from Project

Sometimes you might need to exclude a single file from your project, so that it will be ignored by inspections, code completion, etc.
This is done using the Mark as plain text action.

When a file is marked as plain text, WebStorm does not use it anymore for code completion and navigation. Such file is shown
as plain text in the editor, and is denoted with a special icon in the
Project tool window.

The reverse action is also available: you can return a file to its original type, using the Mark as <file type> action.